Small Gels in an LLDPE Film Product

Running an LLDPE Resin on a Cast Film Process with Unmixed Gels in the Extrudate 

Maddock-style mixer 2 1.5 mm undercut on the mixing flight 

The lead length was 172 mm for the main flight of the barrier section and 114.3 mm for all other sections of the screw. The main flight width and clearance were 11 and 0.11 mm, respectively, in all sections of the screw. The first 2.7 diameters of the screw were inside a water-cooled feed casing. The compression ratio was 2.5 and the compression rate of the barrier section was 0.0030. The depth of the solids channel at the end of the barrier section was 3.2 mm. The specific rotational flow rate was calculated at 5.9 kg/(h-rpm).  

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